SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '706fd900b72df86e44f89e22d5f51323496f5fedf38b48eff1a2e51d17fe3bd5' 
  AND token = 'BnTOBg4Lhp4ovnZcDYG8wrW645GI83kzR2vSOkqSLyM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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