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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c15debb468c9145cb2aedba5cdcb6e661f50e48c1af1d6c713c19ffafb8686c3' 
  AND token = 'YpECiIOmfzGDYY/VaV/4GpvEQrWBfDIYXsZOzj+Ez4o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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