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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '177c7caa673e858338493ddd2494f0f045891a913d64b7c5bf02c9d1dd3b14fb' 
  AND token = 'eEy99PA40T+mTsYVl8J2xGqoGdYYIExa4yJTjI4cP18=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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