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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '335b86206b917f85952e800001c92d5987c2e250c9fa862b4b9d82c22d665828' 
  AND token = 'bQYFcRTpweNPR2ft9fSA6vAChnUGb84PlNvsxn78bYM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}