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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cef19673f5f30bf5fdef6ef9e8c4e63039baf3cc1d5381e62f0ce63a0eb09f80' 
  AND token = 'ldhdPEeOTxJQYFhh+WTIg8pKE8eCWGxwn0TzVPZecGs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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