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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c266a3ee02e1f2af332686011de3b64024066dd72019896999055b07ba7aab4a' 
  AND token = '8vRLmfWE+sXH7rZK4iW6Hxnl1uZwiSHBnGf8WZeEAJM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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