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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '26d68ac5d94986695dc23c52883b55be1e1b064bac67d0957ea368f814ac3fc3' 
  AND token = 'laXjotKedsOfeu6fEjdgO2ahAbK2wrd/0Ar2GptGuzA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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