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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'dd9cdf69748e185b8c594fd3eeaac570371c8e3b40d6933b126341ccf16a9391' 
  AND token = 'f6D3OeMop9U1Skj8no/4amL8ESkNwIW/RTqHkUElyIE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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