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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b85206c5cd47f0657308ee3b76d19bff90cdbe37e9c465e14fd4819004ba1925' 
  AND token = 'NaY8P4Yaw4CsBaPSXS4w5hzaHFoQ0Mh9aHdo34+sGro=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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