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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '84f58a5af60ecff450dd1993fcc7f45a3fa54c3b21567d9936ee7a12879671f3' 
  AND token = 'xFQ0C6NjrOr7ZFeLsm3hfUatqvfxfJkjyfBA++mnjUg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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