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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c3cbc4d5216592f64eef8b567566e2549b994283d8412a64f42410f686a444b1' 
  AND token = '+jB3L6NxrzKbFiHQYQC3Sbo4F2Aqt6aEll6sUUDlRZ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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