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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3b9c9517efff4e3b900acb94133c3f24fe3e3dd15c4caba515e7f05b9ef1c726' 
  AND token = 'nqWZPCaOSpuenif4+js/u6/DWo0wAwg9pjQNbUrU/y0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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