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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5db9c15b804668857652627278981171bafc5b577c80ad91500f60a1cfc8c1e3' 
  AND token = '6PC5b0hnWuhYKSGPCzSv1XxP1PCu3elsZBU71+7KrDY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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