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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6bede07bbbd3e7f1395744971ec6989b12e68f1690b74f2259087512256578d3' 
  AND token = 'JHAxIsmabTKrMvVhE9TnV+LhfrWa6Ah6g6loHbBbvec=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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