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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9c17a693fb3af38e2a62fe05e1971d724470119755d5292dcb0e0f24682ce98e' 
  AND token = 'uu6AF3q1UFXUJYE8RvBkQMR9YPy4o8g9TSdgz41B15c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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