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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6631b01d460160ad9f759cbb9f4952385f48d0fb8e2973232aaa609f9eb4c54c' 
  AND token = 'XDEr3uTHyGTLn9eH3XF4tn5ZcgsIVTyEmsOSxK4PY+4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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