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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0dfdc950061bc6754276942677d8532c671db0c87565ab79fd201423583ebd1a' 
  AND token = '0PXlWy9kwH8imRBE+1FQSLahB9z964AS4a6rg2WxgTQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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