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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c72c2d64948de1b54ae3d1aa4d717cc4da389a4e8c26c86a681bddd118414fb3' 
  AND token = 'z6wMiv0ah6sZk6IBz2/2u0q8I+J7mc1XzoMDdSvdOjQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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