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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b9562285b0e97a875e7e3fe53a056ca3efcadc438620cf452bb73f8e37de0ff2' 
  AND token = 'PGLz6aTpvqG9kHI7PBv5jGLD+zG72CNx82Bb5DBn6bc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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