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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3e5849dc9a33ad3cbb128dc0070050574a59ef771d01177f514c935cf99c18d9' 
  AND token = 'J+OWaNCwVESIyi3gAibRcgpUTqICEOPU9aYZDtKFerY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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