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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8b3c54a2d0b725765734f242c4d26ee4d715f6e71e91327d89fa09d899a7e8fc' 
  AND token = 'grSh+IkS+bagKGRrwl4xneGWJdSNQd3eZ2W4PvZWLM4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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