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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1b09d27f89b854567bfca349b5dbd825a4271a4114f653d17f5812a8591b8649' 
  AND token = 'j4NNclcOHC6WnWpw776MSbQXM+oZk55vEnkqhEUZm0w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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