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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '75fd4a3e752f9ce65bc14492e44cca7b66fe1767d79054b9265dbc204608cd2e' 
  AND token = 'l6k7UnnWWxfLNul4xskIhHdX4dhs3pv85rO5wtj8IrI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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