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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cb4a0bdc51eec8ab315f2d86fe2ce12b168c4fa0fc5e9242d69e0999462ebf9c' 
  AND token = '4eNgYbnOMYJIJLKuY93IcogNvsoIp9cFFfrLUd+Jf1Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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