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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c5954458bee6747874ab2e27c4753dff3cff38d86c7e114623f6bb7b2e0b75ae' 
  AND token = '0q9eP3HEFu3OesU2nwHoKLt6S4b+S9L6Gjx4MqWi6BE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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