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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9c8eb0ddab1acbcb2a4dae1bf6ee566e5b6add59c9657967f6affbe5b5207c15' 
  AND token = 'UhrGam8Hc3TC8yPVa6x//Vh1Zkz7MDbMrrybGLqWfb0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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