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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ad1dbd56f63a2479da69516f092ffff965dceffb20e08a4977e9cad86331fa6b' 
  AND token = '48r1/+E06a83C63m/DbjPQ4EuoqlcH4x+q3G8HXVnx8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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