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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2c75a42d0e8a4fa17ab55ce8cc7422d5dc33c8aac90ba07e92dccee1e5034461' 
  AND token = 'ewncu10o5Da4L2I0959pdSOm8YpYFsCtixmL1NbsEF4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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