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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3cd59267ad035cb8427aded663f778891f1dea5c79753f8a7181f7b3fd8e5e90' 
  AND token = 'ZHkNAhTrQEIM9ZpFGrVFKGyeSTEhXr4hF9yg2KkrbJI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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