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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2fc00653574f3b640ccc1b098f8f4ce0a1e3212052fbe492598645b236202541' 
  AND token = 'd8S/T6auaNCr6hlngEVaGa4louXiD4x7McN+Z2Ei/OQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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