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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8d61852708cf388c0f6531639e2cff04a1a79dc46d461df9eb8d1e954ba84fcc' 
  AND token = 'Bs1IeeSkenAQuoZmmL8pdTq7E01pBgWHsngAMHvMgvg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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