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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cda0df8e803d0e804106a0e7d2a8ea2f244f8959edc2d188dccfb93609bcc97c' 
  AND token = '/SJ/Wgc7SPwUJY6FFMOl2BYAfB5mwLLS8tifJdfAfbs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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