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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3b06dedabe2aa1f2f4b46fac1865f8cb20b3f03daa7c770615af32a0998ef3fe' 
  AND token = 'rYcK/6Ixs6hgBOn00blaof+E2XicsyK5I8m1rrPrmNc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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