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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e635e9b508804a8c28509a3b391f8da2144cd6bf8e7d1fde97adfdb743e29a81' 
  AND token = '3I40g8HiE/MyEvHGxn18PTTlWb4zUyN1ExL+O3QANpA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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