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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6439ad4f33bfbfb32a3c77eeffc36a59606c08b0e20848f1f83a8e1ccad3397a' 
  AND token = 'GL8epRewyyaVs2R4nSc2G+TReUIB48jMTSJE5u1afhs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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