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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '26428944a10eee6b91d33429690b35c99aef0c42940c144c1b1d81a18a3769cb' 
  AND token = 'SVxoAR9qgoqhaGTu3Lm3/n/H6nK0OfjATOnihmY6ikA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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