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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '36bad3205737ee9724ced0a2a8e720594f19bf210199e5d6d20c571c9c8039d1' 
  AND token = 'jsX4/twEudaj1O9+VqaAMmMEXOjE7vYynaXkY0ayH5k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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