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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '259941d05de2f4c4ff5fdff0422dbd8a6167ec0a2f055e51d5fc531c584ee9e0' 
  AND token = 'MJlNPMOLZT6IZ6LA/PRICCpywhE/VFq+WSrD9fjC7+o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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