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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b28ddd391c04cfca17b478eeb15b1c72246122db930391a329a21de9bebb4c12' 
  AND token = '61B3QDC2a4iItjhloSFzX/0z+0ORn095lPFwp3Y+Zww=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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