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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cf4ad0a4158ee50ca32fa0dd902c6e83b58c6a49793e268749a08045dc75a1bf' 
  AND token = 'DY7qRnqlJ64ozYg/wFb2vmO5wNadgg0Rgu7c3GA6Ycs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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