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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '688a7c324024573190fa1fbd51d8dafb37b3df5dd599f4b4db655ea77be6dee3' 
  AND token = '1jlWLnHWSeauB15L61PRVVusjT/VxwI9a59Q3sDkWc4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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