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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1073c39446792997b3cb90ea273d36c1e3798e94d5cf4e6cf228a044b974984b' 
  AND token = 'iQK0Jjc2cGGJWV1xsf35yy0/Aq+cFPcr+Z4SsaPqTyc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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