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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '66661b9b9940e59f5142d6cc90db4af52ae8c256e9b1d0ed9e5149fda89324e4' 
  AND token = 'RSK2LSrtWbkomtOfCygrK3jIepmN362AZWwblV4UEbQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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