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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'be926054834883f06156a4db69bd78aed23524e1506a5235e04a6c1eb0ed7a86' 
  AND token = 'CeitrQW58IZN19DstwQa9GAdwZky0AhieSHtQS75l3w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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