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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '588f03db016d6faadcdf272e9b7c6fa619f406c840c568682e66dbe27c83389d' 
  AND token = '+neXSueFbx1x/utcpiivL3bb1RB0sp6qmRhfGr1n8xM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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