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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c2ee8286d5a00b788399827c9e9d08a82d346a72f5b1d1d14fdb626bc105789b' 
  AND token = 'tj+Za81an50qLfQ315CA6nr68H7LlSbuVwOSWCBc+BU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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