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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9ddb8c096dc0eef3aa9691571e1f95da149d6a2d7d70662b8803c06663465a6b' 
  AND token = 'Sz9X4wnAmGPuIOy450L+aZiDZQN2Kq0I1nWiBaF5kPU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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