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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f7db26e4032e493671ade14458ad5e57c5edc16feaa27e2ac3ee0af65fc6a509' 
  AND token = 'GRJm9mP5DWqw3+kkhyTeC8yJ6188IZN6M5JPnpHPZ3s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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